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Electromagnetic waves within a terahertz frequency range are becoming critical to investigating molecules, materials, and possible applications that are operated by both visible light and infrared rays. This book discusses sensing, imaging, and optoelectronic technologies of terahertz electromagnetic waves in theory and experiments. Most terahertz technologies can be explained by fundamentals of applied physics that have been demonstrated in other spectral ranges. However, the optoelectronic technology and corresponding configurations of imaging and sensing techniques are so special for various terahertz material polarization waves, which are excited in solid-state media by high-peak power lasers and waveguide transportation. Thus, this book also specifies terahertz parameters and available technologies.

Terahertz technology.

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Terahertz (THz) science deals with the physics, technology, and application of the last unexplored region of the electromagnetic spectrum. The THz region (located between 0.1 and 10 THz) fosters a vast range of sensing for applications in different fields, such as astronomy, non-destructive characterization of materials, communications, defense and security, medicine, and more. This book contributes to three of the main research areas of THz science: THz time-domain spectroscopy, which is the backbone of materials analysis using THz radiation, the use of new 2D materials to develop future THz technology, and the interaction between THz radiation and biology. The contributors to this book are recognized specialists in the THz field.

Terahertz technology.

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Terahertz imaging looks set to become an integral part of future applications from semiconductor quality control to medical diagnosis. This will only become a reality when the technology is sufficiently cheap and capabilities adequate to compete with others. Single-pixel cameras use a spatial light modulator and a detector with no spatial-resolution in their imaging process. The spatial-modulator is key as it imparts a series of encoding masks on the beam and the detector measures the dot product of each mask and the object, thereby allowing computers to recover an image via post-processing. They are inherently slower than parallel-pixel imaging arrays although they are more robust and cheaper, hence are highly applicable to the terahertz regime. This chapter dedicates itself to terahertz single-pixel cameras; their current implementations, future directions and how they compare to other terahertz imaging techniques. We start by outlining the competing imaging techniques, then we discuss the theory behind single-pixel imaging; the main section shows the methods of spatially modulating a terahertz beam; and finally there is a discussion about the future limits of such cameras and the concluding remarks express the authors' vision for the future of single-pixel THz cameras.

Terahertz spectroscopy. --- Spectroscopy, Terahertz --- Spectrum analysis

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The realization of terahertz external amplitude modulators with a carrier frequency of 0.8 THz is presented for application in the next generation near-field wireless communications.

Electromagnetic devices --- Terahertz technology

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Terahertz technology. --- Plasma frequencies.